Service Levels Annex 1 to this Part A of this Call Off Schedule sets out the Service Levels the performance of which the Parties have agreed to measure. The Supplier shall monitor its performance of this Call Off Contract by reference to the relevant performance criteria for achieving the Service Levels shown in Annex 1 to this Part A of this Call Off Schedule (the Service Level Performance Criteria) and shall send the Customer a Performance Monitoring Report detailing the level of service which was achieved in accordance with the provisions of Part B (Performance Monitoring) of this Call Off Schedule. The Supplier shall, at all times, provide the Services in such a manner that the Service Levels Performance Measures are achieved. If the level of performance of the Supplier of any element of the provision by it of the Services during the Call Off Contract Period: is likely to or fails to meet any Service Level Performance Measure or is likely to cause or causes a Critical Service Failure to occur, the Supplier shall immediately notify the Customer in writing and the Customer, in its absolute discretion and without prejudice to any other of its rights howsoever arising including under Clause 12 of this Call Off Contract (Service Levels and Service Credits), may: require the Supplier to immediately take all remedial action that is reasonable to mitigate the impact on the Customer and to rectify or prevent a Service Level Failure or Critical Service Level Failure from taking place or recurring; and if the action taken under paragraph (a) above has not already prevented or remedied the Service Level Failure or Critical Service Level Failure, the Customer shall be entitled to instruct the Supplier to comply with the Rectification Plan Process; or if a Service Level Failure has occurred, deduct from the Call Off Contract Charges the applicable Service Level Credits payable by the Supplier to the Customer in accordance with the calculation formula set out in Annex 1 of this Part A of this Call Off Schedule; or if a Critical Service Level Failure has occurred, exercise its right to Compensation for Critical Service Level Failure in accordance with Clause 13 of this Call Off Contract (Critical Service Level Failure) (including subject, for the avoidance of doubt, the proviso in Clause 13.1.2 of this Call Off Contract in relation to Material Breach). Approval and implementation by the Customer of any Rectification Plan shall not relieve the Supplier of any continuing responsibility to achieve the Service Levels, or remedy any failure to do so, and no estoppels or waiver shall arise from any such Approval and/or implementation by the Customer. SERVICE CREDITS Annex 1 to this Part A of this Call Off Schedule sets out the formula used to calculate a Service Credit payable to the Customer as a result of a Service Level Failure in a given service period which, for the purpose of this Call Off Schedule, shall be a recurrent period of [one Month] during the Call Off Contract Period (the Service Period).
